1 /*
2 * Copyright (C) 2009 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17 #include <stdio.h>
18 #include <unistd.h>
19 #include <stdlib.h>
20 #include <string.h>
21
22 #include "edify/expr.h"
23 #include "updater.h"
24 #include "install.h"
25 #include "blockimg.h"
26 #include "minzip/Zip.h"
27 #include "minzip/SysUtil.h"
28
29 // Generated by the makefile, this function defines the
30 // RegisterDeviceExtensions() function, which calls all the
31 // registration functions for device-specific extensions.
32 #include "register.inc"
33
34 // Where in the package we expect to find the edify script to execute.
35 // (Note it's "updateR-script", not the older "update-script".)
36 #define SCRIPT_NAME "META-INF/com/google/android/updater-script"
37
38 struct selabel_handle *sehandle;
39
main(int argc,char ** argv)40 int main(int argc, char** argv) {
41 // Various things log information to stdout or stderr more or less
42 // at random (though we've tried to standardize on stdout). The
43 // log file makes more sense if buffering is turned off so things
44 // appear in the right order.
45 setbuf(stdout, NULL);
46 setbuf(stderr, NULL);
47
48 if (argc != 4) {
49 printf("unexpected number of arguments (%d)\n", argc);
50 return 1;
51 }
52
53 char* version = argv[1];
54 if ((version[0] != '1' && version[0] != '2' && version[0] != '3') ||
55 version[1] != '\0') {
56 // We support version 1, 2, or 3.
57 printf("wrong updater binary API; expected 1, 2, or 3; "
58 "got %s\n",
59 argv[1]);
60 return 2;
61 }
62
63 // Set up the pipe for sending commands back to the parent process.
64
65 int fd = atoi(argv[2]);
66 FILE* cmd_pipe = fdopen(fd, "wb");
67 setlinebuf(cmd_pipe);
68
69 // Extract the script from the package.
70
71 const char* package_filename = argv[3];
72 MemMapping map;
73 if (sysMapFile(package_filename, &map) != 0) {
74 printf("failed to map package %s\n", argv[3]);
75 return 3;
76 }
77 ZipArchive za;
78 int err;
79 err = mzOpenZipArchive(map.addr, map.length, &za);
80 if (err != 0) {
81 printf("failed to open package %s: %s\n",
82 argv[3], strerror(err));
83 return 3;
84 }
85
86 const ZipEntry* script_entry = mzFindZipEntry(&za, SCRIPT_NAME);
87 if (script_entry == NULL) {
88 printf("failed to find %s in %s\n", SCRIPT_NAME, package_filename);
89 return 4;
90 }
91
92 char* script = malloc(script_entry->uncompLen+1);
93 if (!mzReadZipEntry(&za, script_entry, script, script_entry->uncompLen)) {
94 printf("failed to read script from package\n");
95 return 5;
96 }
97 script[script_entry->uncompLen] = '\0';
98
99 // Configure edify's functions.
100
101 RegisterBuiltins();
102 RegisterInstallFunctions();
103 RegisterBlockImageFunctions();
104 RegisterDeviceExtensions();
105 FinishRegistration();
106
107 // Parse the script.
108
109 Expr* root;
110 int error_count = 0;
111 int error = parse_string(script, &root, &error_count);
112 if (error != 0 || error_count > 0) {
113 printf("%d parse errors\n", error_count);
114 return 6;
115 }
116
117 struct selinux_opt seopts[] = {
118 { SELABEL_OPT_PATH, "/file_contexts" }
119 };
120
121 sehandle = selabel_open(SELABEL_CTX_FILE, seopts, 1);
122
123 if (!sehandle) {
124 fprintf(cmd_pipe, "ui_print Warning: No file_contexts\n");
125 }
126
127 // Evaluate the parsed script.
128
129 UpdaterInfo updater_info;
130 updater_info.cmd_pipe = cmd_pipe;
131 updater_info.package_zip = &za;
132 updater_info.version = atoi(version);
133 updater_info.package_zip_addr = map.addr;
134 updater_info.package_zip_len = map.length;
135
136 State state;
137 state.cookie = &updater_info;
138 state.script = script;
139 state.errmsg = NULL;
140
141 char* result = Evaluate(&state, root);
142 if (result == NULL) {
143 if (state.errmsg == NULL) {
144 printf("script aborted (no error message)\n");
145 fprintf(cmd_pipe, "ui_print script aborted (no error message)\n");
146 } else {
147 printf("script aborted: %s\n", state.errmsg);
148 char* line = strtok(state.errmsg, "\n");
149 while (line) {
150 fprintf(cmd_pipe, "ui_print %s\n", line);
151 line = strtok(NULL, "\n");
152 }
153 fprintf(cmd_pipe, "ui_print\n");
154 }
155 free(state.errmsg);
156 return 7;
157 } else {
158 fprintf(cmd_pipe, "ui_print script succeeded: result was [%s]\n", result);
159 free(result);
160 }
161
162 if (updater_info.package_zip) {
163 mzCloseZipArchive(updater_info.package_zip);
164 }
165 sysReleaseMap(&map);
166 free(script);
167
168 return 0;
169 }
170